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Fair Value Measurements (Assets And Liabilities Recorded At Fair Value On A Recurring Basis) (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Trading securities $ 138 $ 115
Investment securities available-for-sale 9,940 10,104
Derivative assets 817 760
Total assets at fair value 10,895 10,979
Derivative liabilities 462 409
Deferred compensation plan liabilities 86 90
Total liabilities at fair value 548 499
Level 1 [Member]
   
Trading securities 86 91
Investment securities available-for-sale 90 113
Derivative assets 0 0
Total assets at fair value 176 204
Derivative liabilities 0 0
Deferred compensation plan liabilities 86 90
Total liabilities at fair value 86 90
Level 2 [Member]
   
Trading securities 52 24
Investment securities available-for-sale 9,610 9,558
Derivative assets 814 757
Total assets at fair value 10,476 10,339
Derivative liabilities 462 403
Deferred compensation plan liabilities 0 0
Total liabilities at fair value 462 403
Level 3 [Member]
   
Trading securities 0 0
Investment securities available-for-sale 240 433
Derivative assets 3 3
Total assets at fair value 243 436
Derivative liabilities 0 6
Deferred compensation plan liabilities 0 0
Total liabilities at fair value 0 6
Interest Rate Contracts [Member]
   
Derivative assets 593 602
Derivative liabilities 247 253
Interest Rate Contracts [Member] | Level 1 [Member]
   
Derivative assets 0 0
Derivative liabilities 0 0
Interest Rate Contracts [Member] | Level 2 [Member]
   
Derivative assets 593 602
Derivative liabilities 247 253
Interest Rate Contracts [Member] | Level 3 [Member]
   
Derivative assets 0 0
Derivative liabilities 0 0
Energy Derivative Contracts [Member]
   
Derivative assets 190 115
Derivative liabilities 189 115
Energy Derivative Contracts [Member] | Level 1 [Member]
   
Derivative assets 0 0
Derivative liabilities 0 0
Energy Derivative Contracts [Member] | Level 2 [Member]
   
Derivative assets 190 115
Derivative liabilities 189 115
Energy Derivative Contracts [Member] | Level 3 [Member]
   
Derivative assets 0 0
Derivative liabilities 0 0
Foreign Exchange Contracts [Member]
   
Derivative assets 31 40
Derivative liabilities 26 35
Foreign Exchange Contracts [Member] | Level 1 [Member]
   
Derivative assets 0 0
Derivative liabilities 0 0
Foreign Exchange Contracts [Member] | Level 2 [Member]
   
Derivative assets 31 40
Derivative liabilities 26 35
Foreign Exchange Contracts [Member] | Level 3 [Member]
   
Derivative assets 0 0
Derivative liabilities 0 0
Warrants [Member]
   
Derivative assets 3 3
Warrants [Member] | Level 1 [Member]
   
Derivative assets 0 0
Warrants [Member] | Level 2 [Member]
   
Derivative assets 0 0
Warrants [Member] | Level 3 [Member]
   
Derivative assets 3 3
Other Derivative Liabilities [Member]
   
Derivative liabilities   6
Other Derivative Liabilities [Member] | Level 1 [Member]
   
Derivative liabilities   0
Other Derivative Liabilities [Member] | Level 2 [Member]
   
Derivative liabilities   0
Other Derivative Liabilities [Member] | Level 3 [Member]
   
Derivative liabilities   6
U.S. Treasury and Other U.S. Government Agency Securities [Member]
   
Investment securities available-for-sale 20 20
U.S. Treasury and Other U.S. Government Agency Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 20 20
U.S. Treasury and Other U.S. Government Agency Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 0 0
U.S. Treasury and Other U.S. Government Agency Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 0 0
Residential Mortgage-Backed Securities [Member]
   
Investment securities available-for-sale 9,564 [1] 9,512 [1]
Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 0 [1] 0 [1]
Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 9,564 [1] 9,512 [1]
Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 0 [1] 0 [1]
State And Municipal Securities [Member]
   
Investment securities available-for-sale 24 [2] 24 [2]
State And Municipal Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 0 [2] 0 [2]
State And Municipal Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 0 [2] 0 [2]
State And Municipal Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 24 [2] 24 [2]
Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member]
   
Investment securities available-for-sale 1 1
Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 0 0
Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 0 0
Auction-Rate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 1 1
Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member]
   
Investment securities available-for-sale 46 46
Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 0 0
Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 46 46
Other Corporate Debt Securities [Member] | Corporate Debt Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 0 0
Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member]
   
Investment securities available-for-sale 215 408
Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 0 0
Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 0 0
Auction-Rate Preferred Securities [Member] | Equity And Other Non-Debt Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 215 408
Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member]
   
Investment securities available-for-sale 70 93
Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member] | Level 1 [Member]
   
Investment securities available-for-sale 70 93
Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member] | Level 2 [Member]
   
Investment securities available-for-sale 0 0
Money Market And Other Mutual Funds [Member] | Equity And Other Non-Debt Securities [Member] | Level 3 [Member]
   
Investment securities available-for-sale 0 0
Deferred Compensation Plan Assets [Member]
   
Trading securities 86 90
Deferred Compensation Plan Assets [Member] | Level 1 [Member]
   
Trading securities 86 90
Deferred Compensation Plan Assets [Member] | Level 2 [Member]
   
Trading securities 0 0
Deferred Compensation Plan Assets [Member] | Level 3 [Member]
   
Trading securities 0 0
Residential Mortgage-Backed Securities [Member]
   
Trading securities 7 [1] 2 [1]
Residential Mortgage-Backed Securities [Member] | Level 1 [Member]
   
Trading securities 0 [1] 0 [1]
Residential Mortgage-Backed Securities [Member] | Level 2 [Member]
   
Trading securities 7 [1] 2 [1]
Residential Mortgage-Backed Securities [Member] | Level 3 [Member]
   
Trading securities 0 [1] 0 [1]
Other Government-Sponsored Enterprise Securities [Member]
   
Trading securities 2 9
Other Government-Sponsored Enterprise Securities [Member] | Level 1 [Member]
   
Trading securities 0 0
Other Government-Sponsored Enterprise Securities [Member] | Level 2 [Member]
   
Trading securities 2 9
Other Government-Sponsored Enterprise Securities [Member] | Level 3 [Member]
   
Trading securities 0 0
State And Municipal Securities [Member]
   
Trading securities 43 12
State And Municipal Securities [Member] | Level 1 [Member]
   
Trading securities 0 0
State And Municipal Securities [Member] | Level 2 [Member]
   
Trading securities 43 12
State And Municipal Securities [Member] | Level 3 [Member]
   
Trading securities 0 0
Corporate Debt Securities [Member]
   
Trading securities   1
Corporate Debt Securities [Member] | Level 1 [Member]
   
Trading securities   0
Corporate Debt Securities [Member] | Level 2 [Member]
   
Trading securities   1
Corporate Debt Securities [Member] | Level 3 [Member]
   
Trading securities   0
Other Securities [Member]
   
Trading securities   1
Other Securities [Member] | Level 1 [Member]
   
Trading securities   1
Other Securities [Member] | Level 2 [Member]
   
Trading securities   0
Other Securities [Member] | Level 3 [Member]
   
Trading securities   $ 0
[1] Residential mortgage-backed securities issued and/or guaranteed by U.S. government agencies or U.S. government-sponsored enterprises.
[2] Primarily auction-rate securities.